GB1276941A - Radiotelephonic system - Google Patents
Radiotelephonic systemInfo
- Publication number
- GB1276941A GB1276941A GB04112/70A GB1411270A GB1276941A GB 1276941 A GB1276941 A GB 1276941A GB 04112/70 A GB04112/70 A GB 04112/70A GB 1411270 A GB1411270 A GB 1411270A GB 1276941 A GB1276941 A GB 1276941A
- Authority
- GB
- United Kingdom
- Prior art keywords
- channel
- relay
- frequency
- signal
- transmitter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
1276941 Automatic exchange systems. INTERNATIONAL STANDARD ELECTRIC CORP 24 March 1970 [2 April 1969] 14112/70 Heading H4K A radiotelephone system has a central relay station which operates automatically and includes n complete transmitter/receiver units operating on different frequencies which can be used simultaneously and when one of said channels is not busy it transmits a low power signal comprising a low frequency modulation of its carrier frequency so that the subscriber sets which can scan the range of frequencies will lock on to this available channel. Relay station (Fig. 1).-This comprises a plurality of transmitter/receiver units each operating at a different carrier frequency and arranged so that when a first unit is available other units are disabled. Under standby conditions one channel radiates an availability signal controlled by a relay (4a) whose contacts insert a resistance into the transmitter circuitry to reduce the radiated power and inhibit operation of the adjacent channel (b). All the subscriber sets will be locked to the frequency Fa due to the presence of the low frequency modulating signal Fi and call for service on a first come first served basis by radiating a modulated carrier signal Fd for 500 ms. When signal Fd is detected in channel (a) a second relay (8a) operates to disable relay (4a) to restore the transmission to full power and to enable adjacent channel (b) which now transmits the availability signal Fi on its carrier frequency Fb. Relay (8a) also connects the transmitter directly to the receiver and is held until a break of 30 secs. in conversation allows a timer to discharge. When relay (8a) drops the channel (a) will return to the standby condition ready to radiate the availability signal when enabled by the contacts of relay (4) in an adjacent channel. Subscriber set (Fig. 2).-This consists of a transmitter (25) and receiver (23) which are connected alternately to a single antenna (29) and are tuned to the frequencies of the relay station channels by a ring counter (30) controlled by a clock pulse generator (33) which is operative until the availability frequency Fi is detected when the sets locks on to that frequency and the indicator lamp (75) is extinguished. Each set is provided with a plurality of push-buttons (50) providing a sequence of frequencies representing digits 1-10 and an additional key for radiating the frequency Fd. To make a call the hand-set (54) is lifted and the keyswitch Fd operated for at least 500 ms. to acquire the available relay station channel. The decimal keyswitches are operated corresponding to the number of the required subscriber and a relay (35) operates to put loudspeaker (39) in circuit. In the called set the frequency Fd is detected followed by the number code frequencies which if detected as correct cause a bi-stable circuit (59) to be set and energize relays which operate a calling signal oscillator (79) whose output is applied to the loud-speaker (39). If no response is obtained, i.e. the microphone (54) is not lifted, the bistable circuit will reset after a time delay causing a second bi-stable circuit (60) to be set, thus starting the clock pulse generator (33) to search for the next free channel frequency. Whenever the free channel is occupied the bi-stable circuit (60) will cause the search for a new channel to resume. Reference has been directed by the Comptroller to Specification 1,010,299.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR6910036A FR2044847A5 (en) | 1969-04-02 | 1969-04-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1276941A true GB1276941A (en) | 1972-06-07 |
Family
ID=9031791
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB04112/70A Expired GB1276941A (en) | 1969-04-02 | 1970-03-24 | Radiotelephonic system |
Country Status (6)
Country | Link |
---|---|
US (1) | US3707679A (en) |
CH (1) | CH522994A (en) |
DE (1) | DE2015198C3 (en) |
ES (1) | ES378171A1 (en) |
FR (1) | FR2044847A5 (en) |
GB (1) | GB1276941A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4649567A (en) * | 1985-04-22 | 1987-03-10 | General Electric Company | Dispatch overdialing for inter-group and other added calling/called access to communications channels in a trunked radio communications system |
US4682367A (en) * | 1985-11-13 | 1987-07-21 | General Electric Company | Mobile radio communications system with join feature |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2340136C1 (en) * | 1973-08-08 | 1978-04-27 | Siemens Ag | Radio transmission system |
US4013958A (en) * | 1975-10-14 | 1977-03-22 | The Magnavox Company | Sampled communication system |
AU533404B2 (en) * | 1978-10-30 | 1983-11-24 | General Electric Company | Radio communication system and method |
US4409687A (en) * | 1978-10-30 | 1983-10-11 | General Electric Company | Arrangement and method for establishing radio communication in a system |
US4360927A (en) * | 1979-03-12 | 1982-11-23 | General Electric Company | Repeater trunking system |
JPS56116341A (en) * | 1980-02-19 | 1981-09-12 | Nec Corp | Radio channel switching system in communication |
US4347625A (en) * | 1980-06-16 | 1982-08-31 | General Electric Company | Arrangement for cellular operation of a repeater trunking system |
US6897773B2 (en) * | 2002-01-25 | 2005-05-24 | Alfred Dennis Ridley | Computer powered wire(less) ultra-intelligent real-time monitor |
US8092251B2 (en) * | 2007-12-29 | 2012-01-10 | Apple Inc. | Active electronic media device packaging |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2803744A (en) * | 1953-08-14 | 1957-08-20 | Bell Telephone Labor Inc | Radiant energy signaling system |
US2848545A (en) * | 1955-09-27 | 1958-08-19 | Bell Telephone Labor Inc | Radiant energy signaling system |
BE625528A (en) * | 1961-12-01 | |||
US3387212A (en) * | 1964-06-09 | 1968-06-04 | Mu Western Electronics Co Inc | Mobile radio paging system wherein the receivers are all made operative for a brief interval following a transmitted tone burst |
FR1462279A (en) * | 1965-09-21 | 1966-04-15 | Cit Alcatel | Random carrier frequency radio links |
FR1497524A (en) * | 1966-05-26 | 1967-10-13 | Materiel Telephonique | Automatic mobile radiotelephone network |
FR1540400A (en) * | 1967-06-16 | 1968-09-27 |
-
1969
- 1969-04-02 FR FR6910036A patent/FR2044847A5/fr not_active Expired
-
1970
- 1970-03-24 GB GB04112/70A patent/GB1276941A/en not_active Expired
- 1970-03-28 DE DE2015198A patent/DE2015198C3/en not_active Expired
- 1970-03-31 CH CH472270A patent/CH522994A/en not_active IP Right Cessation
- 1970-03-31 US US24116A patent/US3707679A/en not_active Expired - Lifetime
- 1970-04-02 ES ES378171A patent/ES378171A1/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4649567A (en) * | 1985-04-22 | 1987-03-10 | General Electric Company | Dispatch overdialing for inter-group and other added calling/called access to communications channels in a trunked radio communications system |
US4682367A (en) * | 1985-11-13 | 1987-07-21 | General Electric Company | Mobile radio communications system with join feature |
Also Published As
Publication number | Publication date |
---|---|
DE2015198A1 (en) | 1970-11-05 |
ES378171A1 (en) | 1972-05-16 |
US3707679A (en) | 1972-12-26 |
DE2015198B2 (en) | 1977-06-30 |
DE2015198C3 (en) | 1981-05-27 |
CH522994A (en) | 1972-05-15 |
FR2044847A5 (en) | 1971-02-26 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
435 | Patent endorsed 'licences of right' on the date specified (sect. 35/1949) | ||
PCNP | Patent ceased through non-payment of renewal fee |